Which two statements best describe intra-domain route summarization? (Choose two.)

A. EIGRP and OSPF must be manually configured to summarize at non-classful boundaries.
B. EIGRP and OSPF automatically summarize at classful network boundaries.
C. OSPF and RIP automatically summarize at classful network boundaries.
D. EIGRP and RIP automatically summarize at classful network boundaries.
E. EIGRP and OSPF automatically summarize at non-classful boundaries.
Correct Answer: AD
Section: Routing
Explanation
Explanation/Reference:
Both RIPv2 and EIGRP automatically summarize at Classful network boundries

auto-summary (EIGRP)
To restore the default behavior of automatic summarization of subnet routes into network-level routes, use the auto-summary command in router configuration
mode. To disable this function and transmit subprefix routing information across classful network boundaries, use the no form of this command.
auto-summary
no auto-summary
auto-summary (RIP)
To restore the default behavior of automatic summarization of subnet routes into network-level routes, use the auto-summary command in router configuration
mode. To disable this function and send subprefix routing information across classful network boundaries, use the no form of this command.
auto-summary
no auto-summary
Usage Guidelines
Route summarization reduces the amount of routing information in the routing tables. RIP Version 1 always uses automatic summarization. If you are using RIP
Version 2, you can turn off automatic summarization by specifying the no auto-summary command. Disable automatic summarization if you must perform
routing between disconnected subnets. When automatic summarization is off, subnets are advertised.

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